What is CVE-2025-21808?

CVE-2025-21808 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 6.3 onward and patched in 6.6.76, 6.12.13, 6.13.2 and others. CVE-2025-21808 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2025-21808?

CVE-2025-21808 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2025-21808?

Yes, CVE-2025-21808 has been patched. Fixed versions include 6.6.76, 6.12.13, 6.13.2 and others. If you are running Linux kernel 6.3 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2025-21808 actively exploited?

CVE-2025-21808 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2025-21808

Medium

In the Linux kernel, the following vulnerability has been resolved: net: xdp: Disallow attaching device-bound programs in generic mode Device-bound programs are used to support RX metadata kfuncs. These kfuncs are driver-specific and rely on the driver context to read the metadata. This means they can't work in generic XDP mode. However, there is no check to disallow such programs from being attached in generic mode, in which case the metadata kfuncs will be called in an invalid context, leading to crashes. Fix this by adding a check to disallow attaching device-bound programs in generic mode.

Package Linux Kernel

Published 2025-02-27

Last modified 2025-10-28

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected versions

Linux kernel versions 6.3 and later are affected. Fixed in 6.6.76, 6.12.13, 6.13.2, 6.14 and their respective stable series.

Affected from

≥ 6.3

Fixed in

✓ 6.6.76 6.6.x ✓ 6.12.13 6.12.x ✓ 6.13.2 6.13.x ✓ 6.14

References

The following references provide additional information about CVE-2025-21808 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/3595599fa8360bb3c7afa7ee50c810b4a64106ea
Patch
Kernel patch commit
https://git.kernel.org/stable/c/557707906dd3e34b8a8c265f664d19f95799937e
Patch
Kernel patch commit
https://git.kernel.org/stable/c/5a9eae683d6c36e8a7aa31e5eb8b369e41aa66e1
Patch

4 patch commits total View all on NVD

Details

CVE ID CVE-2025-21808

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2025-02-27

Modified 2025-10-28

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2025-21808?

CVE-2025-21808 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 6.3 onward and has been patched in 6.6.76, 6.12.13, 6.13.2 and others. CVE-2025-21808 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2025-21808?

CVE-2025-21808 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2025-21808?

Yes — CVE-2025-21808 has been patched. Fixed versions include 6.6.76, 6.12.13, 6.13.2 and others. If you are running Linux kernel 6.3 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2025-21808 actively exploited?

No — CVE-2025-21808 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.